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Expired European patentEurope

Process for the preparation of 4-fluorophthalic anhydride

EP 0127803 B1 · Applicant: OCCIDENTAL CHEMICAL CORPORATION

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Overview

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Listed from its EPO record in Patent Yard's archive of European patents past their term. Its claims, description and drawings are in the EPO PDF and on Google Patents, and the Claude kit works from them.

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Why it's free to use

  • Filed May 11, 1984 and granted August 16, 1989. A European patent lasts at most 20 years from filing, so its term ended May 11, 2004.
  • A supplementary protection certificate, which can extend a medicine or crop-protection patent, adds at most five and a half years, so even that would have ended by November 11, 2009.
  • We check European rights only. A US or other national patent in its family could still be in force: check its family on Espacenet or Google Patents.
FiledMay 11, 1984
PublishedDecember 12, 1984
GrantedAugust 16, 1989
Term endedMay 11, 2004
Application numberEP 84105363
Classification (CPC)C07C51/567

Timeline

Timeline From EPO dates

1985198719891991199319951997199920012003Application filedMay 11, 1984PublishedDec 12, 1984Patent grantedAug 16, 1989Term endedMay 11, 2004

Sources & verification

Official EPO records

Full published documentClaims, description and drawings as a PDF.EPOEuropean Patent RegisterProcedure, status, file inspection and legal events.EPOLinked open EP data recordThe bibliographic record this page is built from.EPO

Cross-check elsewhere

Google PatentsFull text, worldwide family, citing patents and legal events.patents.google.comEspacenetNational family members and their legal status.European Patent Office

Everything on this page comes from the EPO record linked above. EPO data used under CC BY 4.0.